Question

On average I sleep 7 hours and 45 minutes each day. Therefore, during one year I sleep for 7.45 x 365 = 2719.25 hours. Why is this calculation incorrect? And what is the correct answer?

Answer 1

2830.6875 hours of sleep per year (7.45 should be 7.75)

Explanation:

To find your average sleep per year, you need to covert avg hours per day, to days per year.

Note that 45 minutes is not equivalent to .45 hours, but actually .75 hours since there are only 60 minutes in an hour. ( 45 / 60 == .75 )

Simply, the amount of days per year is 365.25 (to account for leap years).

So perform this calculation:

(7.75 hrs / day ) * ( 365.25 days / year ) == 2830.6875 hrs / year

Meaning, on average you get 2830.6875 hours of sleep per year.